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There are 4 samples of 40 individuals each interviewed to find out how often they visit a fast food restaurant in the week. The averages of each sample were 2.5, 3.4, 2.3 and 3.0. If the average is 2.85 and its standard deviation is 50 and we assume that the population is normally distributed.
a) Find the sampling error for each sample
b) Find the standard error
What should the cut-off score be for the interviews? (Round to nearest whole number).
Select a legitimate sampling strategy and collect at least 30 data points using your created question or topic. Discuss the sampling strategy in sufficient detail so that someone else could repeat your data collection without any difficulties or q..
A store asked 250 of its customers whether they were satisfied with the service or not. The responses were also classified according to the gender of the customers. We want to study whether there is a relationship between satisfaction and gender.
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
He measures the heights of 25 men from this century and finds the mean and standard deviation for his sample.
Basic Statistics problem
What is the predictive value of a negative test result? In other words, what is the probability that an individual who returns a negative tests for hypertension is not hypertensive? Please give your answer to 3 decimal places.
Determine the mean annual amount spent on household consumption per family with a sample of 100 families, an average amount of $8,000 spent, and if the population standard deviation is $500,
Based on this survey, what conclusions can you reach about the use of the Internet at work.
The world record time (in minutes) in the marathon is plotted versus the year in which the record was set for men and women separately. The plotting symbol o is used for men and x for women. The data include only records set between 1908 and 1988.
Given that consumer changed te brands, what is the probability that consumer purchased fewer products than before?
At the 5% level of significance, can we infer that the difference in the level of satisfaction with service between the two branches is wider than 5 p.c. points?
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